Alright, let's work through 21671764 times 86319516 step by step
21671764 × 86319516 = 86319516 × (21671764)
+ 86319516 × 4 that equals 345278064
+ 86319516 × 60 that results in 5179170960
+ 86319516 × 700 that equals 60423661200
+ 86319516 × 1000 yielding 86319516000
+ 86319516 × 70000 that results in 6042366120000
+ 86319516 × 600000 that equals 51791709600000
+ 86319516 × 1000000 giving us 86319516000000
+ 86319516 × 20000000 giving us 1726390320000000

= 1870696179346224
